Microstructure and mechanical properties of hypereutectic Al-Si alloy modified with Cu-P

作     者：ZHANG Henghua DUAN Haili SHAO Guangjie XU Luoping ZHANG Henghua,DUAN Haili,SHAO Guangjie,and XU LuopingSchool of Materials Science and Engineering,Shanghai University,Shanghai 200072,China

作者机构：School of Materials Science and Engineering Shanghai University Shanghai 200072 China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2008年第27卷第1期

页      面：59-63页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：hypereutectic Al-Si alloy microstructure mechanical properties Cu-P master alloy modification 

摘      要：The microstructure and mechanical properties of Al-14.6Si castings modified by Cu-P master alloy under different conditions were studied with optical microscope（OM） and mechanical testing and simulation（MTS）.The results indicate that the Cu-P master alloy possesses not only obvious modification effect,but also longevity effect with more than 8 h on the hypereutectic Al-Si *** is shown from thermal calculation,scanning electron microscope（SEM）,and energy dispersive analysis of X-rays（EDAX） that the modification mechanism of Cu-P on primary silicon in the castings is heterogeneous nucleation around AlP *** Cu-P master alloy has no or little modifying effect on eutectic silicon,even though it has obvious modification on primary silicon in the *** may be because of the fast transformation of eutectic silicon at a very narrow temperature,which will notably weaken the role of AlP particles as heterogeneous nuclei for eutectic silicon.